CVE-2020-14364 : Exploit Details and Defense Strategies

An out-of-bounds read/write access flaw in the USB emulator of QEMU versions before 5.2.0 allows a guest user to crash the QEMU process or potentially execute arbitrary code on the host.

Understanding CVE-2020-14364

This CVE involves a vulnerability in QEMU versions before 5.2.0 that could lead to a denial of service or the execution of arbitrary code.

What is CVE-2020-14364?

CVE-2020-14364 is an out-of-bounds read/write access flaw in the USB emulator of QEMU versions before 5.2.0. It occurs when processing USB packets from a guest, potentially leading to a crash or code execution.

The Impact of CVE-2020-14364

The vulnerability allows a guest user to crash the QEMU process, resulting in a denial of service, or potentially execute arbitrary code with the privileges of the QEMU process on the host.

Technical Details of CVE-2020-14364

This section provides more technical insights into the CVE.

Vulnerability Description

The flaw occurs in the USB emulator of QEMU versions before 5.2.0, triggered by USB packets from a guest exceeding 'data_buf[4096]' in certain routines.

Affected Systems and Versions

Product: QEMU
Vendor: n/a
Versions Affected: QEMU versions before 5.2.0

Exploitation Mechanism

The issue arises when USBDevice 'setup_len' exceeds its 'data_buf[4096]' in specific routines, leading to a crash or potential code execution.

Mitigation and Prevention

Protecting systems from CVE-2020-14364 is crucial for maintaining security.

Immediate Steps to Take

Update QEMU to version 5.2.0 or later to mitigate the vulnerability.
Monitor vendor advisories for patches and security updates.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Implement network segmentation and access controls to limit exposure to potential threats.

Patching and Updates

Apply patches provided by QEMU or relevant vendors to address the vulnerability.